A buffer is made up of equal volumes (451.8 mL of each) of 0.812 M A H and 0.885 M A minus. 24.51 mL of 0.712 M HCl is added to the buffer. How many moles of A H are present after the addition of HCl? Please use correct significant figures. Answer: (0.384) (mol)
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A buffer is made up of equal volumes (451.8 mL of each) of 0.812 M A H and 0.885 M A minus. 24.51 mL of 0.712 M HCl is added to the buffer. How many moles of A H are present after the addition of HCl? Please use correct significant figures.
| (0.384) | (mol) |
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- When 20.00 ml of sulfuric acid of unknown concentration is titrated with 0.1249 M NaOH, 32.50 ml of titrant are needed to reach the end point. What is the molarity of the sulfuric acid? (Give both the calculator answer and the significant figure answer).When 20.00 ml of sulfuric acid of unknown concentration is titrated with 0.1249 M NaOH, 32.50 ml of titrant are needed to reach the end point. What is the molarity of the sulfuric acid? Please give calculator answer and sig fig anwserMaleic acid (H2C4H2O4, represented by H2M) is the precursor of malic acid widely used in industry. food as an acidulant and in the pharmaceutical industry it is used in the treatment of wounds. This acid can be determined by neutralization titration. Answer the items below about this determination. Considering a 15.0 mL sample of maleic acid-based product used in industry, determine the maleic acid concentration, in mol/L, in the sample knowing that 21.7 mL of a solution of 0.1120 mol/L NaOH for complete neutralization of this acid. How many grams of maleic acid were in the sample analyzed and what is its percentage (%, m/v) in the sample? [Answer; m=0.1405 mol L-1; percentage = 0.9365%] NaOH(aq) + H2M(aq) Na2M (aq) + H2O(l) Suggest an appropriate indicator for the titration of this acid by looking at the titration curve profile below (IMAGE)
- A 0.2637-g of primary-standard-grade benzoic acid was used to standardize a solution of barium hydroxide. An end point was observed after 46.75 mL of base was added. What will be the molar concentration of the base?A 350 Ml BUFFER SOLUTION WAS PREPARED BY A CHEMIST BY MIXING A 0.135 m ch3cooH AND 0.100 m cHcooK. ACCIDENTALLY, you added 12 mL of an unlabeled solution to the buffer solution during the experiment. your groupmate, later on, identified this to be 1.5 M HCL whcih was mistakenly left unlabeled when she went out to urinate. compute the following: use the pKb value of 7.62 1. what is the number of moles of HCL contanied in the 12 Ml solution added? 2. what is the number of moles of CH3COOH whcih participated in the reaction upon adding 12 ml of 1.5 M HcL? 3. what is the number of moles of CH3COOk which participated in the reaction upon adding 12 Ml of 1.5 M hcl? 4. what is the pH of the original buffer solution? 5. what is the ph of the final buffer solution 6. what is the change in pH in percentageA 250.0-mg sample of an organic weak acid is dissolved in an appropriate solvent and titrated with 0.0556 M NaOH, requiring 32.58 mL to reach the end point. Determine the compound’s equivalent weight.
- What weight of sample should be taken for analysis sos that the volume of 0.1074N NaOH used for titration equals the percentage of potassium acid phthalate (KHC8H4O4) in the sample (Answer 2,193 g)If 25 mL of 0.05 N NaOH required 30 mL of sulfuric acidfor titration. What is the normality of the acid?A student prepared a 1:1 buffer, for which [HAc] = [Ac-] = 0.05491 M. Using their 1:1 buffer and a 0.09477 M HCl solution, the student prepared Solution C in Part 3 of the experimental procedure. Given this information, how many moles of HAc were there in the student's Solution C before a reaction took place? Report your final answer, in moles, to 6 decimal places and only include the numerical value (no units). Do not use scientific notation to answer this question. Solution C contains 20mL of buffer and 5mL of HCl.
- A student prepared a 1:1 buffer, for which [HAc] = [Ac-] = 0.05120 M. Using their 1:1 buffer and a 0.10392 M HCl solution, the student prepared Solution C in Part 3 of the experimental procedure. Given this information, how many moles of Ac- were there in the student's Solution C before a reaction took place? Report your final answer, in moles, to 6 decimal places and only include the numerical value (no units). Do not use scientific notation to answer this question. Solution C contains 20ml of buffer and 5ml of HClHow many mls of 1 M NaOH titront are needed to react with 5 mls of 0.1 KHT? (Use the ml*M/ coefficient= ml*m/coefficient formula to solve this problem)A student prepares a weak acid solution by dissolving 0.2400 g HZ to give 100. mL solution. The titration requires 30.0 mL of 0.1025 M NaOH. Calculate the molar mass of the acid. (a) Would the molar mass be too high, too low, or unaffected if the student accidentally used 0.1400 g in the calculation? Explain. ex. too high/too low/unaffected and directly proportional/inversely proportional/ unrelated (b) Would the molar mass be too high, too low, or unaffected if the student accidentally used 20.0 mL instead of 30.0 mL? Explain. ex. too high/too low/unaffected and directly proportional/inversely proportional/ unrelated
